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Relative Scaling and Positioning.

Question

Say I have a control, and I added other controls (in this case a Canvas) and I also have other controls within it (Images). Now when the screen is resized or the Canvas resize, the images' size and position stayed the same (see image below). Edit: I
used C++ and XAML.

A natural question then arise. Is there a way to scale/position child controls base on parent controls?